<template>
  <div class="xtx-carousel" @mouseenter="handleclose" @mouseleave="automatic">
    <!-- 轮播图图片内容 -->
    <ul class="carousel-body">
      <li
        class="carousel-item"
        :class="{ fade: index === clickNum }"
        v-for="(item, index) in banners"
        :key="item.id"
      >
        <!-- 如果 item 是对象则渲染 -->
        <div class="slider" v-if="Array.isArray(item)">
          <router-link
            v-for="goods in item"
            :key="goods.id"
            :to="`/goods/${goods.id}`"
          >
            <img :src="goods.picture" alt="" />
            <p class="name ellipsis">{{ goods.name }}</p>
            <p class="price">&yen;{{ goods.price }}</p>
          </router-link>
        </div>
        <!-- 如果 item 是字符串则渲染 -->
        <RouterLink to="/" v-else>
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>
    </ul>
    <!-- 返回上一张轮播图 -->
    <a href="javascript:" class="carousel-btn prev" @click="handleSwitch(-1)">
      <i class="iconfont icon-angle-left"></i>
    </a>
    <!-- 切换下一张轮播图 -->
    <a href="javascript:" class="carousel-btn next" @click="handleSwitch(1)">
      <i class="iconfont icon-angle-right"></i>
    </a>
    <!-- 小圆点 -->
    <div class="carousel-indicator">
      <span
        v-for="(item, index) in banners"
        :key="index"
        :class="{ active: index === clickNum }"
        @click="handleSpan(index)"
      ></span>
    </div>
  </div>
</template>

<script>
import { onMounted, onUnmounted, ref } from "vue";

export default {
  name: "XtxCarousel",
  props: ["autoplay", "autoTime", "banners"],
  setup(props) {
    // 保存点击后的数字
    let clickNum = ref(0);
    // 定时器
    let timer = null;

    // 自动轮播
    const automatic = () => {
      // console.log(banners.value);
      if (props.autoplay) {
        // console.log(11);
        timer = setInterval(() => {
          handleSwitch(1);
        }, props.autoTime);
      }
    };

    // 鼠标移入解除自动轮播
    const handleclose = () => {
      clearInterval(timer);
    };

    // 切换轮播图
    const handleSwitch = (value) => {
      clickNum.value += value;
      if (clickNum.value < 0) {
        return (clickNum.value = props.banners.length - 1);
      } else if (clickNum.value > props.banners.length - 1) {
        return (clickNum.value = 0);
      }
    };

    // 点击小点导航
    const handleSpan = (num) => {
      clickNum.value = num;
    };

    onMounted(automatic);
    onUnmounted(handleclose);

    return {
      handleSwitch,
      clickNum,
      handleSpan,
      handleclose,
      automatic,
    };
  },
};
</script>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;

  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }

    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;

      &.fade {
        opacity: 1;
        z-index: 1;
      }

      img {
        width: 100%;
        height: 100%;
      }

      .slider {
        display: flex;
        justify-content: space-around;
        padding: 0 40px;

        > a {
          width: 240px;
          text-align: center;

          img {
            padding: 20px;
            width: 230px !important;
            height: 230px !important;
          }

          .name {
            font-size: 16px;
            color: #666;
            padding: 0 40px;
          }

          .price {
            font-size: 16px;
            color: @priceColor;
            margin-top: 15px;
          }
        }
      }
    }

    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;

      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;

        ~ span {
          margin-left: 12px;
        }

        &.active {
          background: #fff;
        }
      }
    }

    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;

      &.prev {
        left: 20px;
      }

      &.next {
        right: 20px;
      }
    }
  }

  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
